AS/NZS (IEC , Ed. , MOD). Australian/New Zealand Standard. Explosive atmospheres. Part Design. You may be required to comply with this standard if you intend to undertake electrical work in areas where flammable gas or vapour risks may arise. Where. Looking for advice on AS-NZS & other AS-NZS certification standards? Contact E-x Solutions on (08) to speak to one of our experts today.
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In such situations verification is possible by testing for vertical flame spread of vertically-mounted bunched wires or cables in accordance with lEC series. If sheaths or coverings are marked by a colour, the colour used for cables containing intrinsically safe circuits shall be light blue. NOTE 2 Gas or vapour migration and propagation of flame may occur through the interstices between the strands of standard stranded conductors, or between individual cores of nze cable.
This would make equipment selection easier and provide the ability to better apply a risk assessment approach, where appropriate. In the event that the conduit is installed in a corrosive area, the conduit material shall either be corrosion resistant or the conduit shall be adequately protected against corrosion.
When evaluating the minimum thickness of the insulation to be used or specified it is necessary to allow for any expected wear under normal usage. If a protective earthing PE conductor is necessary, it shall be separately insulated in a manner similar to the other conductors and shall be incorporated within the supply cable sheath. ZA 4v1 li ;ray;: In special circumstances, a higher temperature may be permitted or a lower temperature may be required, in which case the temperature shall be marked on the pressurized enclosure.
This may be achieved by connection to a switch-room earth bar or by the use of separate earth rods. NOTE 2 Since the use of insulated conductor or cable which retards flame propagation and complies with the recommended requirements of lEC is not sufficient by itself to prevent propagation of fire under all conditions of installation, it is recommended that wherever the risk of propagation is high, for example in long vertical runs of bunches of cables, special installation precautions should also be taken.
Either this, or one of the types of cables suitable for use with transportable equipment may be used. Cold flow could give rise to a reduction in the insulation resistance of the cable and, where reasonably practical, efforts should be made to prevent this by selection of suitable cable glands. NOTE 2 Where cables are secured to equipment or cable trays the bend radius on the cable should be in compliance with the cable manufacturers data or be at least 8 times the cable diameter to prevent damage to the cable.
A code of practice can be defined as a result of legislation or by industry regulators and bodies. NOTE 1 The use of alunninium conductors in Ex ‘d’ flameproof enclosures should be avoided in those cases where a fault leading to potentially severe arcing involving the conductors may occur in the vicinity of a plain flanged joint. The reduced voltage increases the motor current, and slip and therewith increases the temperature of the motor in the stator and rotor.
NOTE 12 The above additional protection is not required if the resistance-heating device for example an anti- condensation heater in an electric motor is intended to be protected by the manner in which it is installed in the electrical equipment. The insulation provided by a non-metallic outer sheath on a cable will usually be sufficient to avoid this. If the total sum of the risk factors is greater than 6, then anti-condensation space heaters shall be employed, and special measures shall be applied to ensure that the enclosure does not contain an explosive gas atmosphere at the time of starting.
In these circumstances, further advice shall be sought see also 5. This Amendment applies to Clauses 4. For group I applications, ;1: NOTE 1 The switching devices installed in the general switchgear are normally adequate with respect to emergency switch-off facilities. If, for transportable and portable electrical equipment, a metallic flexible armour or screen is incorporated in the cable, this shall not be used as the only protective conductor. The equiprrient apparatus group of the intrinsically safe circuit is the same as the lowest gas grouping of any of the items of electrical equipment forming that circuit for example a circuit with MB and IIC equipment will have a circuit grouping of MB.
In the case of laser radiation for example, signalling, telemeters, surveying, range-finders the energy or power density even of the unfocused beam at long distances may be so great that ignition is possible.
Due to heat losses, it is unlikely that cable temperature will exceed T6. Extraneous conductive parts which are not part of the structure or of the electrical installation, for example frames of doors or windows, need not be connected to bzs equipotential bonding system, if there is no danger of voltage displacement.
It has been recognized that it is beneficial to identify and mark all products according to their inherent ignition risk.
Australian Hazardous Area Standards – AS-NZS | E-x Solutions
Preference should be given to RCDs with a rated residual operating current of 30 mA. Installations with cathodic protection shall not be connected to sa equipotential bonding system unless the system is specifically designed for aa purpose. NOTE The form in which information in the descriptive system document necessary to ensure safety should be kept is not stated precisely and may be covered by a number of sources such as drawings, schedules, maintenance manuals or similar documents.
Precautions shall be taken to prevent operation of multi-phase electrical equipment e. A code of practice is a set of rules which details how people in a certain industry should behave.
Each source shall be capable of maintaining, independently, the required level of pressure or rate of supply of protective gas.
NOTE This requirement is intended to apply to recently designed lamps where the pins or end caps may be plastic or ceramic with a conductive film coating.
Australian New Zealand Standard AS / NZS 60079:2009 Explosive Atmospheres – Western Australia
At any point of transition from TN-C to TN-S, the protective conductor shall be connected to the equipotential bonding system in the non-hazardous area. Where there is a need to use transportable or portable equipment in a hazardous area for which the normally required EPL is not obtainable, a documented program for risk management shall be implemented. NOTE 1 With the exception of item fail of the above are part of the process of hazardous area classification.
The change to the lEC based Standard introduces changes in both technical content and 600799. However th e r e quir e m e nts for non – haz a rdous areas ar e i nsuffic ie nt for inst alla t i ons i n h a z a rdous ar e as. Nnzs equipment, such as an inlet fan or compressor, that is used to supply protective gas should preferably be installed in a non-hazardous area.
Where there is a possibility that dust jzs in excess of 5 mm may be formed on practice A e qfflp m gn t a p p a r a t u sthe maximum permissible surface temperature shall be reduced. The encapsulation ‘m’ standard includes two ss of protection ‘ma’ 06079 ‘mb’. New tape should be applied whenever existing bzs is disturbed; where the enclosure is used in conjunction with gases allocated to group IIC, the tape should not be applied.
Portable electrical equipment with rated voltage not exceeding V to earth and with rated current not exceeding 6 A may have cables with an ordinary polychloroprene or other equivalent synthetic elastomeric sheath, with an ordinary tough rubber sheath, or with an equally robust construction.